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Step by step calculation of overload and short circuit currents

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Determination of overcurrents and short circuit currents

In a heating system a motor-driven pump with a power of 200 kW, cos φ = 0.88, η = 0.93 is connected through an overhead cable with 1= 45 m (Figure 1).

Step by step calculation of overload and short circuit currents
Step by step calculation of overload and short circuit currents (photo credit: oempanels.com)
Determination of overload and short circuit currents
Determination of overload and short circuit currents

Let’s see the calculation of the following:

  1. Operating current
  2. Overload protection
  3. Voltage drop
  4. Protection by cut-off
  5. Short circuit protection
  6. Overcurrent relay
  7. Direct starting

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Edvard Csanyi - Author at EEP-Electrical Engineering Portal

Edvard Csanyi

Hi, I'm an electrical engineer, programmer and founder of EEP - Electrical Engineering Portal. I worked twelve years at Schneider Electric in the position of technical support for low- and medium-voltage projects and the design of busbar trunking systems.

I'm highly specialized in the design of LV/MV switchgear and low-voltage, high-power busbar trunking (<6300A) in substations, commercial buildings and industry facilities. I'm also a professional in AutoCAD programming.

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